hey i have a s4 n/a 13b in a fc and was wondering what gain you get going from a stock flywheel to a 12lb aluminum one i know you dont make more hp with this im just wondering if someone knows a ball park figure on hom much more hp gets to the wheels

 

What gear? It will have a dramatic effect in 1st gear. 3rd gear and up, it's barely noticeable.

The 10-lb doesn't really feel much different from a 21-lb, to me. The flywheel is only a fraction of the rotating mass involved. (The rotors, I think, count twice, because they are not only rotating but they are orbiting as well)

But it is a little noticable in 1st gear, and in my case it was free, so....

 

I recommend it.

 

u recommend putting on a lightweight flywheel? another question i had was what's involved in installing one just need the auto counter weight and pull the old one off and put it on with the counter weight or?

 

http://www.mazdatrix.com/f-writng.htm

http://www.rotaryresurrection.com/2n...vs_aftfly.html

http://www.rotaryresurrection.com/2n...el_remove.html

 

thanx alot evil aviator now i know how to get the old one off and new one on but i heard if i install a light weight flywheel id have 2 take the front cover off and check my "lash" with a depth gauge? is this true or can i just bolt it on?

 

yeah, thats what I wrote.

and yeah just grab the correct engine matching series rear counterweight from the auto trans models or buy a new one from mazdatrix or mazda or wherever.

pull the old clutch off and then flywheel then place the counterweight on rear and I would recommend replacing the rear main seal while your there since its probably high millage. I found it easier to put the assembly on when I didn't have the counterweight bolted to the flywheel, that keyway that lines up always gave me trouble so I just put the counter weight on then bolt the flywheel to the counterweight once its already on the engine.

dont forget to replace your pilot and throw out bearings and take into consideration purchasing of a new clutch since its a lot of work to take the trans out and etc so go nuts!

no lash adjustments of any kind just bolt the sucker on and you can use 2 chain links for a flywheel stopper, put a bolt on the flywheel and a bolt on the block and you can crank off the 2 and 1/8" flywheel nut

dont forget to get some bearing grease

 

ya i got a new clutch disc 2 put in while im doing the flywheel and im going 2 grab the 2 bearings aswell as for the main seal what is high milage? my car has 145,000km

 

If the rear main seal has oil streaming down from it, you need to change it. If not, you can leave it until the engine is rebuilt. At 145k, you have a ways to go.

 

It's cheap insurance. Just put a new one in you tightwods!